I seem to remember that HLMTQ wanted to let William and Catherine have as much normal family time as possible because her own time as a naval wife in Malta had been such a pleasure and fond memory. It's possible that she encouraged fewer engagements.
In his first two years as POW, he's had to take over the Duchy of Cornwall and deal with sick family members. It looks as though he is becoming more confident and active. Trump really likes William. I'm hoping he will be a positive influence for good.
Also, anyone can make changes in Wikipedia. It doesn't mean it's accurate. I always think of this cartoon when I use Wikipedia:
https://smg.media.mit.edu/library/steiner1993.html